“autumnal equinox”的概念、定义、翻译、参考文献-科学参考

单词	autumnal equinox
释义	autumnal equinox [ȯ`tǝm·nǝl `ē·kwǝ´näks] ^ASTRONOMY The point on the celestial sphere at which the sun's rays at noon are 90° above the horizon at the Equator, or at an angle of 90° with the earth's axis, and neither North nor South Pole is inclined to the sun; occurs in the Northern Hemisphere on approximately September 23 and marks the beginning of autumn. Also known as first point of Libra.
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